The Anatomy of a Pipe Bomb Explosion: Measuring the Mass and Velocity Distributions of Container Fragments

Improvised explosive devices such as pipe bombs are prevalent due to the availability of materials and ease of construction. However, little is known about how these devices actually explode, as few attempts to characterize fragmentation patterns have been attempted. In this study, seven devices composed of various pipe materials (PVC, black steel, and galvanized steel) and two energetic fillers (Pyrodex and Alliant Red Dot) were initiated and the explosions captured using high‐speed videography. The video footage was used to calculate fragment velocities, which were represented as particle velocity vector maps. In addition, the fragments were weighed. The results demonstrate a correlation between the type of energetic filler and both the size and velocity of the fragments. Larger fragments were produced by Pyrodex filler indicating a less complete fragmentation, compared with smaller fragments produced by double‐base smokeless powder. Additionally, higher fragment velocities were seen with Alliant Red Dot filler.     

Why revolution ain’t easy: violating norms,re‐socializing society

Society is not only structured by major hierarchical institutions, but also by the unwritten rules, called norms, that govern the practice of daily life within those institutions. Peoples’ unreflective observance of these norms helps to perpetuate inequality and domination in society. Norms are transmitted through a process of socialization, by which every member of society is subtly trained to appreciate and follow these norms. While disobeying norms, or deviance, is possible, it is also fraught with problems and challenges. Ultimately, many things prevent the creation of new, anarchistic norms. Still, even with formidable obstacles in their path, anarchists have attempted to re‐socialize themselves and others in order to adhere to more egalitarian, horizontal, and cooperative norms.     

Use of scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDXA) in identification of foreign material on bullets

The authors report two cases in which examination of foreign material embedded in or adherent to bullets provided critical information in the reconstruction of a crime scene. Analysis of small particles by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA) can be accomplished without destruction or injury of the particles. In one case, the detection and identification of mineral fragments embedded near the nose of a bullet provided conclusive evidence that the bullet had ricocheted from a fireplace before striking the victim. In the second case, analysis of particles from two bullets identified them as them as bone fragments, thus proving which shots fired from a police officer's gun had killed a suspected burglar. SEM-EDXA has not been widely used to identify such material on bullets, but should be considered a potentially powerful tool in forensic science.     

Benefits and costs of the 55 mph speed limit: New estimates and their implications

The national 55 mile-per-hour speed limit was in effect from 1974 to 1987, and over the years many analysts have attempted to measure and compare its costs (enforcement and travel time) and benefits (safety and fuel economy). In 1984 a committee of the National Research Council completed a major study of the speed limit. The following article completes the committee's calculations; summarizes the results in units of money, lives, and travel time; and divides these effects between rural interstates and all other roads. Over a range of plausible dollar values for extra travel time, the cost of saving a life is estimated to be much higher on rural interstates than on other affected roads—and higher than the cost of saving a life by other highway safety measures as well. Hence, proponents of higher speed limits on the rural interstates have a strong case in the debate, which continues in the state legislatures.     

Predictors of Attrition in a Treatment Program for Battering Men

This study examines factors associated with the high attrition rate in treatment programs for men who batter. In accord with past research, we expected demographic variables of age, race, employment status, relationship status, and socioeconomic status to predict attrition. We also hypothesized that attitudinal and personality variables, as well as contextual/program variables, might account for attrition more parsimoniously. Specifically, we hypothesized that attrition would be predicted by frequency and severity of violence, denial of a problem with violence, rigidity of thinking, low levels of self-disclosure, and higher anxiety and constriction in social situations. In addition, we predicted attrition would relate to dependency, maladaptive personality styles, and expectations regarding group counseling (e.g., whether treatment is perceived as aversive). Finally, we proposed that attrition would relate to whether batterer participation in treatment was self-motivated or the result of external pressures. Participants were 61 men enrolled in a batterer treatment program in a mid-sized city. Analyses of variance and discriminant analyses indicated that program attrition was unrelated to demographic, attitudinal, or personality variables. Only the contextual/program variables of mileage traveled to attend and external monitoring of attendance significantly differentiated treatment rejecters, drop-outs, and treatment continuers. Findings are discussed with regard to intrinsic and extrinsic motivational factors. Future directions for exploration are discussed.     

In the eye of the beholder: Meaning and structure of informal status in women's and men's prisons*

Applying an abductive mixed‐methods approach, we investigate the informal status systems in three women's prison units (across two prisons) and one men's prison unit. Qualitative analyses suggest “old head” narratives—where age, time in prison, sociability, and prison wisdom confer unit status—are prevalent across all four contexts. Perceptions of maternal “caregivers” and manipulative “bullies,” however, are found only in the three women's units. The qualitative findings inform formal network analyses by differentiating “positive,” “neutral,” and “negative” status nominations, with “negative” ties primarily absent from the men's unit. Within the women's units, network analyses find that high‐status women are likely to receive both positive and negative peer nominations, such that evaluations depend on who is doing the evaluating. Comparing the women's and men's networks, the correlates of positive and neutral ties are generally the same and center on covariates of age, getting along with others, race, and religion. Overall, the study points to important similarities and differences in status across the gendered prison contexts, while demonstrating how a sequential mixed‐methods design can illuminate both the meaning and the structure of prison informal organization.